Rotary burnishing-tool.



B. P. DINGLEY. ROTARY BURNISHING TOOL.

APPLICATION FILED SEPT. 3, 1909.

1,010,127. v Patentd N0v.28, 1911.

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' WIT/11158853 B'. P. DINGLEY. VROTARY BURNISHING TOOL. vAIPILIOA'IIOIvFILED SEPT. 3,319.09.

1,010,127. v Patented N0v.28,i1911.

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f WIT/VESSES ATTORNEY ments 'UNITED sTATEs PATENT clarion.

BENJAMIN F. DINGLEY, 0F SIIVER SPRING, RHODE ISLAND, ASSIG-NOR T0 ERNESTBAKER, OF PROVIDENCE, RHODE ISLAND.

ROTARY BURNISHING-TOOL.

Specification of Letters Patent.

Fo all whom it maycoucern.

Be it known that I, BENJAMIN F. Drive- LEY, a citizen of the UnitedStates, residing at Silver Spring,- in the county of Providence andState of Rhode Island, have 1nvented certain new and useful ImproveinRotary Burnishing-Tools, of which the following is a specification,reference being had therein to the accompanying drawing.

This invention relates to rotary burnishing tools and has for its'objectto provide a simple and inexpensive device which is vadapted to bereadily applied to a speed lathe head or other similar speeding deviceand rotated at a high velocity for the pur- Y, ofhand burnished work.

poseof providing a rotary burnisher for jewelry, metal ware, or otherarticles on which it might be 'adapted to operate to produce theburnishing effect with great rapidity.

The burnishing of the high lights or-` raised portions of jewelry orother metal Ware has. heretofore usually been done by a hand operatedrubbing tool, which process was comparatively slow, tedious,unsatlsfactory in many cases,'and necessarily expensive, and the desiredeffect could not be produced'in a practical way on many classes of goods.by this primitive method.

,In order to obviate the above diiiculty and reduce to a minimum thetime and labor necessary for producing the desired result I haveprovided a mechanically operated tool that is provided with balls orrounded surfaces slightly protruding from its face or periphery. so thatwhen the work to be finished is brought in contactwith the highlyvpolished surface of said rapidly revolving balls or surfaces thecombination hammering and rubbing action quickly produces the effect ofan extremely high quality My. improved b urnishing tools may be made inany desired shape or form, such as cylinders, cones, hemispheres, disks,or any other convenient shape or shapes as may be necessary or foundadvantageous to operate upon work of different styles and character.

.My preferred method of forming this polishing tool is to loosely mounthighly polished-faced balls which will slightly protrude from thesurface of the same. not restrict myself, however,vto the mounting ofthe balls loosely on the face of the laround its surface.

I do.

tools, as the balls may Abe secured firmly therein, if desired.

The invention consists of othernovel features and parts and combinationsof the same as will-be fully described hereinafter speedv lathe headwith a, disk form of burnisher having balls on its periphery mountedthereon. Fig. Q F is a. transverse section through the-tool showing theballs held in the raceway and one means by which the twodisks o'r sideplates are held in position.

Patented Nov. 2S, 1911.

Fig. 3 is a \side elevation of the burnisher showing the device" withone of its sides or retaining disks removed. .Fig; 4- isa detail of oneof the disks or side plates. Fig.

5'- shows a central tubular hub illustrating arsimple and effectivemeans for securing the side plates or disks together. Fig. 6- shows aburnishing tool of cvlindrical form having balls mounted in concentriccircles Fig. 7* shows a similar shaped tool havingr balls mounted inhelical shaped grooves on its surface. Fig. 8 is a section of thecylinder through one of the grooves. Fig. 9- shows a cove-shaped toolhaving balls set in longitudinal grooves. Fig. 1.0- is a sectional viewof the cone. Fig. 11 is a face View of a hemispherifal tool showingballs set in its surface. Fig. 12- is a side elevation of the same. Fig.13- shows a disk with radial slots containing protruding balls. Fig. 14-shows a disk having concentric circles in which the balls are located.

. Referring tothe drawings l--l in Fig. 2 designate the two ball racemembers preferably employed in the construction of a diskshapedburnisher 'tool having balls loosely mounted in a raceway in its outeredge or periphery. These members are preferably made of steel eitherpressed. drop-forged. or turnedA from solid stock, into the desiredshape and hardened to withstand the wear of the rapidly revolving ballsvmounted lllO hub to assist in positioning' the members.'

which the balls may be set, as in Figs.- 9 and 10. In other cases, suchas for burnishwhich the outer surface of the balls may project. Theou-ter vedges 3 of these inembers are turned inward to retain the ballsin the raceway and are lpreferably formed very thin and on a sharp'receding angle as at 4 so as 4not'to interfere with the movement of thework about thev tool while in.

the operation of burnishing. A simple and effective way of securingthese two members together is to provide a central bore 5 in each intowhich a tubular hub 6, see Fig. 5, is set, a central collar 7 beingformed on the After' the balls B have been positioned in the raceway theouter end of this hub may then be riveted as at 9, seeFig. 2,permanently securing the whole together.

The' central hub 6 is preferably provided .with a tapering hole 10through it whereby the whole device is adapted toY behreadily mounted ona 'corresponding tapering vspindle 11 on the lathe head 12 whereby thistool may receive a rapidly rotating motion. Instead of the balls beingmounted on the edge of a disk they may be set in concentric grooves 13.in Athe face of a cylinder 14, see Fig. 6, which 4may be of-any desiredlength or diameter, the saine being adapted to burnish flat or slightlycurved large figured surfaces. Or in some instances the balls may besetinv helical grooves 15, as illustrated in Fig, 7, or arranged in anyother manner. Then again, in lsome cases a cone-shaped burnishing toolmay be reuired having longitudinal grooves 16 in ing theinner surface ofbowls, cups or the like, a tool of lhemispherical or oval shape is foundconvenient having balls set'in conf centric grooves 17 or in any othermanner over -its face.'` Disks, such as those illustrated in Figs. 13and 14, having radial work is pressed against the highly polished rpidlymoving surfaces of the balls the e ect of hand polished work is almostinstantly produced. Another featurevpf this form of burnishing tool isthat owing to the outward pressure and a slight loosenessv of the ballsin their raceway said balls when coming in contact with the work have atendency to yield slightly and so produce a soft or iesilientcombinationrubbing and f While in most cases the balls mountedl loosely infgroovesare found to be most effective yet in other instances balls set andfixed permanently around the face ofsja burnishing tool are found toproduceertcellent results.

Having thus described my invention, what Iolairnv as new anddesire tosecure by Letters Patent, is:

1 'A rotary burnis a casing, means in the surface of lsaid cas'- ing forreceiving and retaining a plurality of balls so that a portion of saidballs will protrude vbeyondthe surface of said casing, and said casingbeing adapted to be rapidly rotated. v

2. A rotary burnishingtool'comprisinga body portion provided with one ormore grooves adapted to receive and retain a plurality of balls, aportion of each ball being arranged .to project beyond the sur-` face ofsaid body, said bodybeing adapted to be rapidly rotated.

. 3. A rotary burnishing tool comprising a body portion constructed oftwo side plates provided 'with grooves which when placed together form araceway adapted to receive and retain a plurality of balls, a portion ofeach ball being arranged to project beyond the surface of said body, and

means for retaining said side plates together the whole belngadapted tobe rapidly rotated.

In testimony whereof I affix my signature in presence of two witnesses.

vBENJAMIN r. DINGLEY. Witnesses HOWARD E. BnLoW, i E. I. Dennis.

hing ytool comprising'

